diff --git a/cpu/z80/Makefile.z80 b/cpu/z80/Makefile.z80
index ed0e4703a..f1828e403 100644
--- a/cpu/z80/Makefile.z80
+++ b/cpu/z80/Makefile.z80
@@ -2,7 +2,7 @@
 # Makefile for z80/SDCC
 # @author Takahide Matsutsuka <markn@markn.org>
 #
-# $Id: Makefile.z80,v 1.12 2009/07/02 22:36:35 oliverschmidt Exp $
+# $Id: Makefile.z80,v 1.13 2009/07/09 18:26:55 matsutsuka Exp $
 #
 
 ### Compiler definitions
@@ -14,11 +14,12 @@ OBJCOPY  = objcopy
 STRIP    = strip
 
 ### Custom rules
+CUSTOM_RULE_C_TO_OBJECTDIR_O=1
 CUSTOM_RULE_ALLOBJS_TO_TARGETLIB=1
 CUSTOM_RULE_LINK=1
 
 ### Default flags
-CFLAGS  += --std-c99 --vc -mz80
+CFLAGS  += --std-c99 -mz80
 # --peep-file $(CONTIKI_CPU)/z80peephole.def
 ASFLAGS +=
 LDFLAGS += -mz80 --out-fmt-ihx --no-std-crt0
@@ -50,6 +51,10 @@ CONTIKI_PLATFORM_DIRS = $(PLATFORM_APPDIRS) \
 #directives. (i.e. #define, etc.)
 vpath %.cS $(CONTIKI_PLATFORM_DIRS)
 
+#option -MMD doesn't work well on SDCC as of 2.9.0
+$(OBJECTDIR)/%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
 ifndef CUSTOM_RULE_CS_TO_OBJECTDIR_O
 $(OBJECTDIR)/%.o: %.cS
 	cp $< $(OBJECTDIR)/$*.c
diff --git a/cpu/z80/z80def.h b/cpu/z80/z80def.h
index c5110dbcf..4145bfb11 100644
--- a/cpu/z80/z80def.h
+++ b/cpu/z80/z80def.h
@@ -27,7 +27,7 @@
  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * $Id: z80def.h,v 1.6 2008/07/02 15:02:33 matsutsuka Exp $
+ * $Id: z80def.h,v 1.7 2009/07/09 18:26:55 matsutsuka Exp $
  *
  */
 
@@ -87,4 +87,6 @@ typedef unsigned int size_t;
 #define uip_ipaddr_copy(dest, src)		\
     memcpy(dest, src, sizeof(*dest))
 
+#define snprintf(a...)
+
 #endif /* __Z80_DEF_H__ */